Javascript，Php，Ajax

Question

I have a problem with this my script.

$("#login").click(function(event) {

    event.preventDefault();

    var email = $("#email").val();
    var pass = $("#password").val();

    $.ajax({

        url : "login.php",
        method: "POST",
        data: {userLogin:1, userEmail:email, userPassword:pass},
        success : function(data){

            if(data == "1"){

                alert(data);
            }

        }

    })

I want it to alert a value that I am getting from an echo in another php file

<?php

    if(isset($_POST['userLogin'])){

        $email = mysqli_real_escape_string($con, $_POST['userEmail']);

        $password = md5($_POST['userPassword']);

        $sql_login = "SELECT * from database where email = '$email' AND password = '$password'";

        $query_login = mysqli_query($con, $sql_login);

        $count_login = mysqli_num_rows($query_login);

        if($count_login == 1){

            $row_login = mysqli_fetch_assoc($query_login);

            $_SESSION['uid'] = $row_login['user_id'];

            $_SESSION['name'] = $row_login['first_name'];

            echo "1";

        }


    }

    ?>

If I didn't put the alert(data) in an if condition, it displays the value I echo, but I need the condition to enable the right user logged in.

Answer 1

What can IF can also ELSE.

In your ajax add the else conditions to see if it helps uncover the issue:

if (data == "1") {
  alert('youre in');
} else {
  alert('try again');
}

And in your php, also account for the else condition (and do strict checking on that count of rows with ===):

if ($count_login === 1) {
  // code ...
  echo '1';
} else {
  echo 'Sorry, the login is incorrect';
}